Analysis of three-dimensional crack initiation and propagation using the extended finite element method

We present a new formulation and a numerical procedure for the quasi-static analysis of threedimensional crack propagation in brittle and quasi-brittle solids. The extended finite element method (XFEM) is combined with linear tetrahedral elements. A viscosity-regularized continuum damage constitutive model is used and coupled with the XFEM formulation resulting in a regularized ‘crack-band’ version of XFEM. The evolving discontinuity surface is discretized through a C0 surface formed by the union of the triangles and quadrilaterals that separate each cracked element in two. The element’s properties allow a closed form integration and a particularly efficient implementation allowing largescale 3D problems to be studied. Several examples of crack propagation are shown, illustrating the good results that can be achieved